#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
ll n,a,b;
while(cin>>n,n)
{
a=sqrtl(n);
b=a*a;
(b==n)?cout<<"yes":cout<<"no";
cout<<endl;
}
return 0;
}
using namespace std;
typedef long long ll;
int main()
{
ll n,a,b;
while(cin>>n,n)
{
a=sqrtl(n);
b=a*a;
(b==n)?cout<<"yes":cout<<"no";
cout<<endl;
}
return 0;
}
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